cam_pos      = [0.1774, 1.51796, 0.794715]';
cam_dir      = [0.997461, -0.0431641, -0.0566415]';
cam_up       = [-0.0350794, 0.39437, -0.918282]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0824261, -1.22086, -0.521166]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;